package com.ruoyi.common.core.domain;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * MyBatis类型处理器：处理List<String>与JSON字符串的转换
 * 
 * @author ruoyi
 */
public class JsonListTypeHandler extends BaseTypeHandler<List<String>> {

    private static final ObjectMapper objectMapper = new ObjectMapper();

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, List<String> parameter, JdbcType jdbcType)
            throws SQLException {
        try {
            ps.setString(i, objectMapper.writeValueAsString(parameter));
        } catch (JsonProcessingException e) {
            throw new SQLException("Error converting List<String> to JSON string", e);
        }
    }

    @Override
    public List<String> getNullableResult(ResultSet rs, String columnName) throws SQLException {
        String json = rs.getString(columnName);
        return parseJson(json);
    }

    @Override
    public List<String> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        String json = rs.getString(columnIndex);
        return parseJson(json);
    }

    @Override
    public List<String> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        String json = cs.getString(columnIndex);
        return parseJson(json);
    }

    private List<String> parseJson(String json) {
        if (json == null || json.trim().isEmpty()) {
            return new ArrayList<>();
        }
        try {
            return objectMapper.readValue(json, new TypeReference<List<String>>() {
            });
        } catch (JsonProcessingException e) {
            // 如果解析失败，返回空列表
            return new ArrayList<>();
        }
    }
}
